RU2586875C2 - Multiple input - multiple output communication system, supporting different reporting modes - Google Patents

Multiple input - multiple output communication system, supporting different reporting modes Download PDF

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Publication number
RU2586875C2
RU2586875C2 RU2012151279/08A RU2012151279A RU2586875C2 RU 2586875 C2 RU2586875 C2 RU 2586875C2 RU 2012151279/08 A RU2012151279/08 A RU 2012151279/08A RU 2012151279 A RU2012151279 A RU 2012151279A RU 2586875 C2 RU2586875 C2 RU 2586875C2
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Russia
Prior art keywords
precoding matrix
indicator
codebook
subbands
reporting
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RU2012151279/08A
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Russian (ru)
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RU2012151279A (en
Inventor
Дзун Ил ЧОЙ
Бруно КЛЕРКС
Ки Ил КИМ
Дзоон Йоунг ЧО
Дзин Киу ХАН
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Самсунг Электроникс Ко., Лтд.
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Priority to US32963410P priority Critical
Priority to US61/329,634 priority
Priority to US35568110P priority
Priority to US61/355,681 priority
Priority to US35676810P priority
Priority to US61/356,768 priority
Priority to KR10-2011-0014052 priority
Priority to KR1020110014052A priority patent/KR101843019B1/en
Application filed by Самсунг Электроникс Ко., Лтд. filed Critical Самсунг Электроникс Ко., Лтд.
Priority to PCT/KR2011/003183 priority patent/WO2011136600A2/en
Publication of RU2012151279A publication Critical patent/RU2012151279A/en
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Publication of RU2586875C2 publication Critical patent/RU2586875C2/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636Feedback format
    • H04B7/0639Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0417Feedback systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478Special codebook structures directed to feedback optimization
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0632Channel quality parameters, e.g. channel quality indicator [CQI]

Abstract

FIELD: communication system.
SUBSTANCE: invention relates to a communication system with multiple input - multiple output technology to exchange information feedback between the transmitter and receiver in a MIMO communication system. Method comprises a plurality of transmission modes reports used for transmitting the feedback information. Transmitter and receiver generate and share the feedback information based on the corresponding transmission mode reports.
EFFECT: technical result of the invention is to increase the data rate by transmitting feedback information.
34 cl, 10 tbl, 5 dwg

Description

Technical field

The following invention relates to a communication system with multiple inputs - multiple outputs (MIMO) and, in particular, to a technology for exchanging feedback information between a transmitter and a receiver in a MIMO communication system.

State of the art

A MIMO communication system comprises a transmitter and at least one receiver. For example, a MIMO communication system may comprise a base station and at least one terminal device. In downlink communication, the base station can operate as a transmitter, and each of the at least one terminal device can act as a receiver.

A transmitter or receiver operating in a MIMO communication system may comprise multiple antennas and may transmit and receive data through multiple antennas. A wireless channel may be formed between each transmitter antenna of the transmitter and each receiver antenna of the receiver. The transmitter and receiver can exchange information related to the wireless channel to increase the data rate.

In a closed MIMO communication system, the feedback information to be exchanged between the transmitter and the receiver may include a rank indicator reflecting the preferred rank of the receiver, a precoding matrix indicator reflecting the preferred precoding matrix, channel quality information reflecting the quality of the wireless channel and etc. The receiver may select one of a plurality of matrices or vectors included in the codebook using a predetermined codebook. Accordingly, the receiver may feed back the index of the selected matrix or vector as an indicator of the precoding matrix.

Disclosure of invention

Solution

In one general embodiment, a receiver communication method is provided, which includes determining a reporting mode in accordance with feedback information to be transmitted to the transmitter, generating, according to a first codebook, a first indicator of a precoding matrix for a set of multiple subbands, generating a second codebook a second indicator of the precoding matrix with respect to at least one subband of the plurality of subbands and transmitting reverse information ligature to the transmitter, wherein the feedback information includes a first indicator of a precoding matrix and a second precoding matrix indicator.

The communication method may further include generating channel quality information associated with a set of a plurality of subbands based on a precoding matrix that corresponds to both a first precoding matrix indicator and a second precoding matrix indicator, wherein the feedback information further comprises quality information channel.

Feedback information may be transmitted on a shared physical channel uplink (PUSCH).

The first codebook and the second codebook may differ from each other, while the first codebook and the second codebook may correspond to a subset of the same complete codebook.

Channel quality information may be generated based on a predefined rank indicator or rank indicator determined at the receiver. In another general embodiment, a transmitter communication method is provided, including determining a reporting mode in accordance with feedback information transmitted from a receiver to a transmitter, receiving a first precoding matrix indicator and a second precoding matrix indicator, which are transmitted by the receiver in accordance with the transmission mode reporting, and generating a precoding matrix based on the first indicator of the precoding matrix and the second indicator and precoding matrices. In the reporting mode, the first precoding matrix indicator may be generated by the first codebook with respect to a set of multiple subbands, and the second precoding matrix indicator may be generated by the second codebook with respect to at least one subband of the multiple subbands.

The communication method may further include receiving channel quality information associated with a set of multiple subbands.

In the reporting mode, channel quality information can be generated based on the precoding matrix, which corresponds to both the first indicator of the precoding matrix and the second indicator of the precoding matrix.

The first indicator of the precoding matrix and the second indicator of the precoding matrix can be received on the common physical channel of the uplink (PUSCH).

The first codebook and the second codebook may differ from each other, while the first codebook and the second codebook may correspond to a subset of the same complete codebook.

In yet another general embodiment, a receiver communication method is provided, including determining a reporting mode in accordance with feedback information transmitted to a transmitter, generating, according to a first codebook, a first indicator of a precoding matrix for a set of multiple subbands or at least one subband from a plurality of subbands, generating, according to a second codebook, a second indicator of a precoding matrix with respect to a set of a plurality of subbands s or of at least one subband of the plurality of subbands and transmitting the feedback information to the transmitter, wherein the feedback information includes a first indicator of a precoding matrix and a second precoding matrix indicator.

The communication method may further include generating channel quality information associated with a set of a plurality of subbands based on a precoding matrix that corresponds to both a first precoding matrix indicator and a second precoding matrix indicator, wherein the feedback information further comprises quality information channel.

The communication method may further include generating differential information regarding channel quality associated with a set of multiple subbands and channel quality information associated with a predetermined subband from multiple subbands, wherein the feedback information further comprises differential information.

The first codebook and the second codebook may differ from each other, while the first codebook and the second codebook may correspond to a subset of the same complete codebook.

Channel quality information may be generated based on a predefined rank indicator or based on a rank indicator specified in the receiver.

In yet another general embodiment, a transmitter communication method is provided, which includes determining a reporting mode in accordance with feedback information transmitted from a receiver to a transmitter, receiving a first precoding matrix indicator and a second precoding matrix indicator, which are transmitted by the receiver in accordance with the mode reporting, and generating a precoding matrix based on a first indicator of a precoding matrix and a second indicator torus precoding matrix. In the reporting mode, the first precoding matrix indicator may be generated from the first codebook for a set of multiple subbands or at least one subband from multiple subbands, and the second precoding matrix indicator may be generated from a second codebook with respect to a set of multiple subbands or at least one subband of a plurality of subbands.

The communication method may further include receiving channel quality information associated with a set of multiple subbands.

The communication method may further include receiving differential information regarding channel quality associated with a set of multiple subbands and channel quality information associated with a predetermined subband from multiple subbands.

In yet another embodiment, a receiver communication method is provided, including generating a rank indicator indicative of a preferred receiver rank, generating, according to a first codebook, a first indicator of a precoding matrix with respect to a set of a plurality of subbands or a predetermined subband from a plurality of subbands, generating a second code book of the second indicator of the precoding matrix in relation to a set of multiple sub-bands, generating info channel quality ratios associated with a set of multiple subbands, and transmitting a rank indicator at the first reporting time, transmitting a first precoding matrix indicator at a second reporting time, and transmitting a second precoding matrix indicator and channel quality information at a third reporting time.

The first reporting time, the second reporting time, and the third reporting time may correspond to different subframes.

A second precoding matrix indicator and channel quality information may be jointly encoded for transmission.

Transmitting a rank indicator, a first precoding matrix indicator, a second precoding matrix and channel quality information may further include transmitting a rank indicator based on a first reporting period, transmitting a first precoding matrix indicator based on a second reporting period, and transmitting a second matrix indicator precoding and channel quality information based on the third reporting period.

Channel quality information may be generated in accordance with a first precoding matrix indicator and a second precoding matrix indicator.

In yet another general embodiment, a transmitter communication method is provided, which includes determining a reporting mode in accordance with feedback information transmitted from a receiver to a transmitter, receiving a rank indicator from a receiver at the first reporting time, receiving a first indicator of a precoding matrix at a second time transmitting reports and receiving a second precoding matrix indicator with respect to a set of a plurality of subbands and channel quality information associated with a set of a plurality subbands, at the third reporting time, determining, based on the reporting mode, the rank indicator, the first indicator of the precoding matrix, the second indicator of the precoding matrix and channel quality information, and generating the precoding matrix based on at least the first indicator of the precoding matrix and the second precoding matrix indicator.

The first report transmission time, the second report transmission time, and the third report transmission time may correspond to different subframes.

Reception may further include receiving a rank indicator based on a first reporting period, receiving a first precoding matrix indicator based on a second reporting period, and receiving a second precoding matrix indicator and channel quality information based on a third reporting period.

In yet another general embodiment, a receiver communication method is provided, comprising: generating a rank indicator indicative of a preferred receiver rank; generating, according to a first codebook, a first indicator of a precoding matrix for a set of a plurality of subbands or at least one predefined subband of a plurality of subbands generating, according to the second codebook, a second indicator of a precoding matrix with respect to a set of a plurality of sub-codes apazones, generating first channel quality information associated with a set of multiple subbands, generating a third precoding matrix indicator for each predetermined subband of the multiple subbands, generating second channel quality information associated with each predetermined subband of the multiple subbands, and transmitting an indicator rank at the first time reporting, transmitting the first indicator of the precoding matrix to the second e the time of transmitting the reports, transmitting the second indicator of the precoding matrix and the first channel quality information at the third time of transmitting the reports and transmitting the third indicator of the precoding matrix and the second channel quality information at the fourth reporting time.

The first reporting time, the second reporting time, the third reporting time and the fourth reporting time can correspond to different subframes.

The transmission may further include transmitting a rank indicator based on a first reporting period, transmitting a first precoding matrix indicator based on a second reporting period, transmitting a second precoding matrix indicator and channel quality information based on a third reporting period, and transmitting a third matrix indicator precoding and channel quality information based on a fourth reporting period.

In yet another general embodiment, a transmitter communication method is provided, which includes determining a reporting mode in accordance with feedback information transmitted from a receiver to a transmitter, receiving a rank indicator from a receiver at the first time a report is transmitted, receiving a first indicator of a precoding matrix with respect to a set from a plurality of subbands or at least one predefined range from a plurality of subbands at a second reporting time, receiving a second matrix indicator n pre-coding with respect to a set of a plurality of subbands and first channel quality information associated with a set of a plurality of subbands at a third reporting time and receiving a third indicator of a precoding matrix for each predefined subband and second channel quality information associated with each predetermined sub-band, at the fourth reporting time, determination based on the reporting mode of the rank indicator, the first matrix indicator a precoding, a second indicator of a precoding matrix, a first channel quality information, a third indicator of a precoding matrix and a second channel quality information and generating a precoding matrix based on at least a first indicator of a precoding matrix, a second indicator of a precoding matrix and a third indicator of a precoding matrix coding.

The first reporting time, the second reporting time, the third reporting time and the fourth reporting time can correspond to different subframes.

Reception may further include receiving a rank indicator based on a first reporting period, receiving a first precoding matrix indicator based on a second reporting period, receiving a second precoding matrix indicator and first channel quality information based on a third reporting period, and receiving a third indicator precoding matrices and second channel quality information based on the fourth reporting period.

In yet another general embodiment, a communication device is provided that is installed in at least one of the transmitter and receiver and includes a storage device configured to store a first codebook and a second codebook; a processor configured to generate a corresponding precoding matrix indicator by the first codebook and the second codebook and retrieval of the precoding matrix associated with the corresponding indicator of the matrix of the preliminary code A communication interface configured to transmit and / or receive between the transmitter and the receiver the corresponding indicator of the precoding matrix generated by the first codebook and the second codebook, while the first codebook and second codebook are subsets of the complete codebook.

The above methods can be implemented using a program stored on a computer-readable storage medium that does not change over time.

Other features and variations can be understood from the following detailed description, drawings, and claims.

Brief Description of the Drawings

FIG. 1 is a diagram illustrating an example of a multi-user MIMO communication system.

FIG. 2 is a diagram illustrating an example of a communication method of a transmitter and a receiver in which the transmitter and the receiver share a rank indicator, a precoding matrix indicator, and channel quality information.

FIG. 3 is a diagram illustrating an example of a transmitter and a receiver that share a first precoding matrix indicator, a second precoding matrix indicator, and channel quality information.

FIG. 4 is a diagram illustrating an example of a transmitter and a receiver that share a first precoding matrix indicator, a second precoding matrix indicator, channel quality information and difference information.

FIG. 5 is a diagram illustrating an example communication device.

In all the drawings and in the detailed description, unless otherwise indicated, the same reference numerals should be regarded as referring to the same elements, features and structures. The relative size and display of these elements may be exaggerated for clarity, visibility and convenience.

The method of carrying out the invention

The following detailed description is provided in order to help the reader fully understand the methods, devices, and / or systems described herein. In this regard, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein may be proposed to those skilled in the art. In addition, a description of well-known functions and constructions may be omitted to increase clarity and conciseness.

In the following, some examples are described in detail with reference to the accompanying drawings.

In FIG. 1 illustrates an example of a multi-user MIMO communication system.

In accordance with FIG. 1, a MIMO communication system may comprise a base station 110 and a plurality of terminal devices 120, 130, and 140. For downlink communications, the base station can act as a transmitter, and each of the terminal devices 120, 130, and 140 can act as a receiver. In uplink communication, the base station 110 may act as a receiver, and each of the terminal devices 120, 130 and 140 may act as a transmitter.

Hereinafter, examples are described with reference to a base station 110 and a plurality of terminal devices 120, 130, and 140 operating in downlink communication. These examples may also be applicable to uplink communications.

Base station 110 may have multiple antennas, for example, two antennas, four antennas, eight antennas, etc., may pre-encode data streams for downlink data transmission. Base station 110 may check information associated with channels formed between antennas of base station 110 and antennas of each of terminal devices 120, 130 and 140. For example, since base station 110 and terminal devices 120, 130 and 140 can exchange channel related information terminal devices 120, 130, and 140 may transmit channel related information to the base station 110 over the feedback channel.

The channel related information may include a precoding matrix indicator, channel quality information, etc. The same codebook containing a predetermined number of matrices and vectors can be stored in the base station 110 and each of the terminal devices 120, 130 and 140. Each of the terminal devices 120, 130 and 140 can select one matrix or vector from the codebook and appropriately generate a precoding matrix indicator. For example, the index of a selected single matrix or vector may be a precoding matrix indicator. The channel quality indicator may include information related to channel power, information related to interference or noise affecting the channels, etc.

The codebook may also have different sizes, for example, two bits, three bits, four bits, five bits, six bits, etc. For example, a four-bit codebook may contain 2 4 = 16 vectors or matrices. Since a vector is a matrix having only one column, the term “matrix” should be considered to include the concept of “vector”.

Hereinafter, with reference to various examples, a method for exchanging a precoding matrix indicator, channel quality information, a rank indicator, etc. is described. between the base station 110 and the terminal devices 120, 130 and 140.

According to various examples, two different codebooks C 1 and C 2 can be used. For example, the two indicated codebooks C 1 and C 2 can be stored in each of the terminal devices 120, 130 and 140. In this example, each of the terminal devices 120, 130 and 140 can select a preferred precoding matrix W 1 from the code book C 1 and may select a preferred precoding matrix W 2 from another C 2 codebook. Both index W 1 and index W 2 may correspond to indicators of a precoding matrix. Moreover, W 1 corresponds to element C 1 , and W 2 corresponds to element C 2 .

If there are multiple subbands in the frequency domain, the precoding matrix W with respect to one subband substantially used by base station 110 may correspond to functions W 1 and W 2 . For example, W 1 may be associated with a broadband channel characteristic or with a long-term channel characteristic, and W 2 may be associated with a frequency-selective channel characteristic or with a short-term channel characteristic.

Channel Quality Information (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc. can be transmitted and received on one of a common uplink physical channel (PUSCH) and a physical uplink control channel (PUCCH).

Aperiodic CQI / PMI / RI Reporting Using PUSCH

The terminal device can transmit channel quality information, a precoding matrix indicator, and a PUSCH rank indicator on the feedback channel. The terminal device may use various reporting modes, such as in the examples shown in Table 1.

[Table 1] Feedback Type PMI PMI Number One PMI Plenty of PMI Feedback Type PUSCH CQI Broadband
(broadband CQI)
1-2 mode
1-2.1 mode
Selectable by Subscriber Station
(subband CQI)
2-0 mode 2-2 mode
2-2.1 mode
Configurable at a higher level
(subband CQI)
3-0 mode 3-1 mode

The reporting modes used may vary depending on the transmission modes. For example, if there are seven transmission modes 1, 2, 3, 4, 5, 6, and 7, the reporting modes applied to each of the transmission modes 1, 2, 3, 4, 5, 6, and 7 can be expressed as follows.

Transmission mode 1: Report transmission modes 2-0, 3-0

Transfer Mode 2: Report Transfer Modes 2-0, 3-0

Transfer Mode 3: Report Transfer Modes 2-0, 3-0

Transmission Mode 4: Report Transmission Modes 1-2, 2-2, 3-1

Transfer Mode 5: Report Transfer Mode 3-1

Transmission Mode 6: Report Transmission Modes 1-2, 2-2, 3-1

Transmission mode 7: Report transmission modes 2-0, 3-0

In addition to the above transmission modes 1, 2, 3, 4, 5, 6, and 7, transmission mode 8 can be enabled to support reporting modes 1-2, 2-2, and 3-1 when the terminal device accompanies the transmission of PMI and RI reports , and to support 2-0 and 3-0 reporting modes when the terminal device does not accompany the transmission of PMI and RI reports.

In addition, transmission mode 9 can be enabled. Transmission mode 9 can support at least one of the report transmission modes shown in Table 1. In transmission mode 9, the report transmission modes shown in Table 1 can be used even if the number of transmitting antennas has a predetermined value, for example, 2, 4, 8, etc.

In transmission mode 8 and transmission mode 9, when the terminal device accompanies the transmission of PMI and RI reports, reporting modes 1-2, 2-2 and 3-1, 1-2.1 and 2-2.1 can be used. The modes may correspond to updated versions of the reporting modes 1-2, 2-2, and 3-1 and may be applicable, for example, in which there are four transmitting antennas, and for example, in which there are eight transmitting antennas. If the terminal device does not accompany the PMI and RI reporting, the 2-0 and 3-0 reporting modes can be used.

Reporting modes, for example, reporting modes 1-2.1, 2-2.1 and 3-1.1, can have the following implementation:

Whenever a broadband matrix indicator is used to shorten a feedback header or report on a corresponding precoding matrix with respect to allocating a large resource block, a precoding matrix indicator W 1 may be generated. Whenever a broadband matrix indicator having relatively high accuracy is used, an additional broadband matrix precoding matrix indicator W 2 may be generated.

Whenever a subband matrix indicator is applied, an additional precoding matrix indicator W 2 may be generated.

In accordance with the reporting modes, a single subband precoding matrix indicator may be defined in a set of multiple subbands or in a separate subband. CQI can be determined based on the recommended precoding matrix W. The recommended precoding matrix W may correspond to the functions W 1 and W 2 . If W 2 is transmitted with respect to all subbands, or if W 2 is transmitted with respect to a set of subbands, the wideband CQI can be determined based on W. Another example: the wideband CQI can be determined based on W, which is a function of W 1 and W 2 . a subband CQI may be defined in one subband, or may be defined in a subset of a set of multiple subbands. The subband CQI can be determined in subbands based on W, that is, functions W 1 and W 2 .

1. Broadband Feedback

(1) Reporting Mode 1-2:

When transmitting in only one subband with respect to each subband, a precoding matrix indicator of the first precoding matrix W 1 may be generated from the first codebook C 1 .

The terminal device may transmit on the feedback channel one wideband CQI per codeword. The corresponding wideband CQI can be determined by transmitting in the set of subbands if the corresponding precoding matrix W is applied in each subband.

The terminal may transmit, via feedback, a selected indicator of the precoding matrix for each subband. In addition, the size of each subband can be determined in accordance with various methods that are known or specifically designed for the examples described here.

For transmission mode 8 or transmission mode 9, the precoding matrix indicator and CQI can be determined based on the transmitted rank indicator. The first codebook C 1 and the second codebook C 2 may correspond to subsets of the same codebook C.

(2) Reporting Mode 1-2.1:

When transmitting in the set of subbands, the first indicator of the precoding matrix with respect to the set of subbands of the first precoding matrix W 1 can be generated from the first codebook C 1 .

When transmitting only in the selected subband with respect to each subband, a second precoding matrix indicator W 2 can be generated from the second codebook C 2 . In particular, the transmission may be based on W, that is, the functions W 1 and W 2 .

The terminal device may transmit one wideband CQI per codeword. The corresponding wideband CQI can be determined by transmitting in the set of subbands if the corresponding precoding matrix W is applied in each subband. In addition, the terminal device may transmit a second precoding matrix index for each subband.

In transmission mode 1-2.1, the precoding matrix indicator and CQI can be determined based on the transmitted rank indicator, and the subband size can be determined in accordance with various methods that are known or specifically designed for the examples described here.

2. Subband feedback at the upper level

(1) Report Transfer Mode 3-1:

When transmitting in a set of subbands, the first indicator of the precoding matrix of one first precoding matrix W 1 can be generated from the first codebook C 1 . When transmitting in a set of subbands, a second indicator of the precoding matrix of one second precoding matrix W 2 can be generated from the second codebook C 2 .

- The terminal device may transmit one subband CQI per codeword for each subband. The corresponding subband CQI can be determined by transmitting in the corresponding subband if W (that is, a function of W 1 and W 2 ) is applied in all subbands.

The terminal device may transmit one wideband CQI per codeword. The corresponding broadband CQI can be determined by transmitting in a set of subbands if W (i.e., a function of W 1 and W 2 ) is applied in all subbands.

For transmission mode 8 and transmission mode 9, the precoding matrix indicator and CQI can be determined based on the transmitted rank indicator.

(2) Information related to the difference, that is, the difference information between the CQIs regarding the set of multiple subbands and the CQIs subband regarding each codeword can be encoded with two bits.

(3) The subband size can be determined in accordance with various methods that are known or specifically designed for the examples described herein.

3. Feedback in the subband selected by the subscriber station

(1) Reporting Mode 2-2:

When transmitting in a set of subbands, the first indicator of the precoding matrix of one first precoding matrix W 1 can be generated from the first codebook C 1 .

The terminal device may transmit one subband CQI per codeword for each subband. The corresponding subband CQI can be determined by transmitting in a set of subbands if W (that is, a function of W 1 and W 2 ) is applied in all subbands.

The terminal device may transmit a first precoding matrix indicator of one first precoding matrix W 1 with respect to the set of subbands. The terminal device may selectively select a first precoding matrix selected from the first codebook and a set M of preferred subbands having size k within the set of subbands. The first precoding matrix may correspond to a precoding matrix used to transmit M selected subbands.

The terminal device may transmit one CQI based on the transmission in the set of M preferred subbands and the same precoding matrix in each of the M subbands. The terminal may also transmit a first precoding matrix indicator of the selected one first precoding matrix with respect to the M selected subbands.

For transmission mode 8 and transmission mode 9, the precoding matrix indicator and CQI can be determined based on the transmitted rank indicator.

(2) Reporting Mode 2-2.1:

When transmitting in a set of subbands, the first indicator of the precoding matrix of one first precoding matrix W 1 can be generated from the first codebook C 1 .

The terminal device may transmit one wideband CQI per codeword. The corresponding broadband CQI can be determined by transmitting in a set of subbands if one first precoding matrix W 1 is applied in all subbands.

The terminal device may transmit a first precoding matrix indicator of one first precoding matrix W 1 with respect to the set of subbands. The terminal device may selectively select a second precoding matrix W 2 selected from the second codebook and a set M of preferred subbands having a size k within the set of subbands. The precoding matrix W may correspond to the functions W 1 and W 2 and may also correspond to the precoding matrix used for transmitting M selected subbands.

When transmitting only M selected subbands, and if each of the M selected subbands uses the same one precoding matrix W, the terminal may transmit one wideband CQI.

For transmission mode 8 and transmission mode 9, the precoding matrix indicator and CQI can be determined based on the transmitted rank indicator.

With respect to feedback modes in a subband selected by the subscriber station, the terminal may transmit information regarding M selected subbands.

The difference information between the CQIs regarding the M selected subbands for each codeword and the wideband CQIs can be encoded using two bits. An indicator indicative of the position of the M subbands may be encoded using L bits.

Periodic CQI / PMI / RI Reporting Using PUCCH

The terminal device may transmit difference information, such as difference CQI, precoding matrix indicator, and PUCCH rank indicator, through the feedback channel. The terminal device may use various reporting modes, such as in the examples shown in Table 2.

[Table 2] Feedback Type PMI PMI Number One PMI Plenty of PMI Feedback Type PUSCH CQI Broadband
(broadband CQI)
1-0 mode 1-1 mode No
Selectable by Subscriber Station
(subband CQI)
2-0 mode 2-2.0 mode
2-2.1 mode

The reporting modes 1-0, 1-1, 2-0, and 2-1 shown in Table 2 are described in the “3 rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Rel. 8 TS 36.213 ”. New reporting modes may be proposed, such as reporting modes 2-2.0 and 2-2.1, which are further described below.

The reporting modes used may vary depending on the transmission modes. For example, if there are seven transmission modes 1, 2, 3, 4, 5, 6, and 7, the reporting modes applied to each of the transmission modes 1, 2, 3, 4, 5, 6, and 7 can be expressed as follows.

Transmission mode 1: Report transmission modes 1-0, 2-0

Transfer Mode 2: Report Transfer Modes 1-0, 2-0

Transmission Mode 3: Report Transmission Modes 1-0, 2-0

Transmission Mode 4: Report Transmission Modes 1-1, 2-1

Transmission Mode 5: Report Transmission Modes 1-1, 2-1

Transmission Mode 6: Report Transmission Modes 1-1, 2-1

Transmission mode 7: Report transmission modes 1-0, 2-0

In addition to the above transmission modes 1, 2, 3, 4, 5, 6, and 7, transmission mode 8 can be enabled to support reporting modes 1-1 and 2-1 when the terminal device accompanies the transmission of PMI and RI reports, and to support reporting modes 1-0 and 2-0 when the terminal device does not accompany the transmission of PMI and RI reports.

In addition, transmission mode 9 can be enabled. Transmission mode 9 can support at least one of the report transmission modes shown in Table 2. In transmission mode 9, the reporting modes shown in Table 2 can be used even if the number of transmitting antennas has a predetermined value, for example, 2, 4, 8, etc.

Report transmission modes can be classified based on criteria such as i) “off-subband reporting / sub-band reporting” and ii) “W 1 and W 2 are transmitted in different subframes / W 1 and W 2 are transmitted in one subframe”. An additional category can be created by using W 2 as broadband information or subband information. If W 2 is used as broadband information, W 2 can be expressed as W 2_W . If W 2 is used as subband information, W 2 can be expressed as W 2_S . In addition, A || B means that information A and information B are transmitted in different subbands.

As indicated above, new reporting modes may be proposed, such as reporting modes 2-2.0 and 2-2.1

1) Reporting Mode RI, W 1 | | W 2_W , CQI_w

The rank indicator and the precoding matrix indicator W 1 may be transmitted in the same subframe. The rank indicator and the precoding matrix indicator W 1 may be coded together or separately. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W . The precoding matrix indicator W 2_W and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

Since W 2_W is in the second codebook C 2 or in a subset of the second codebook C 2 , the accuracy of the feedback channel transmission may increase. In particular, if PUCCH power control is applied and if an energy limitation is applied, the error propagation can be reduced.

The indicator corresponding to the precoding matrix selected by the first codebook may be called the first indicator of the precoding matrix, and the indicator corresponding to the precoding matrix selected by the second codebook may be called the second indicator of the precoding matrix. The precoding matrix selected by the first codebook may be expressed as W 1 , and the precoding matrix selected by the second codebook may be expressed as W 2 .

2) RI Reporting Mode | | W 1 | | W 2_W , CQI_w

The rank indicator and the precoding matrix indicator W 1 may be transmitted in various subframes. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W . The precoding matrix indicator W 2_W and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

The “rank indicator”, “precoding matrix indicator W 1 ” and “precoding matrix indicator W 2_W and CQI_w" may be transmitted in three different subframes.

Since W 2_W is in the second codebook C 2 or in a subset of the second codebook C 2 , the accuracy of the feedback channel transmission may increase.

3) RI Reporting Mode | | W 1 , W 2_W | | Cqi_w

The rank indicator and the precoding matrix indicator W 1 may be transmitted in various subframes. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook. The precoding matrix indicator W 1 and the precoding matrix indicator W 2_W may be jointly encoded and transmitted in the same subframe.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W .

The “rank indicator”, “the precoding matrix indicator W 1 and the precoding matrix indicator W 2_W ” and “CQI_w” can be transmitted in three different subframes.

4) RI Reporting Mode | | W 1 , W 2_W , CQI_w

The rank indicator and the precoding matrix indicator W 1 may be transmitted in various subframes. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may be selected from the entire range, wherein W 2_W may be selected from the second codebook or from a subset of the second codebook. The precoding matrix indicator W 1 , the precoding matrix indicator W 2_W, and CQI_w may be jointly encoded and transmitted in the same subframe.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W .

The "rank indicator" and the "precoding matrix indicator W 1 , the precoding matrix indicator W 2_W and CQI_w" can be transmitted in two different subframes.

5) Reporting mode RI, W 1 , W 2_W | | Cqi_w

The rank indicator, the precoding matrix indicator W 1, and the precoding matrix indicator W 2_W may be jointly encoded and transmitted in the same subframe. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W .

The “rank indicator, precoding matrix indicator W 1 and precoding matrix indicator W 2_W ” and “CQI_w” may be transmitted in two different subframes.

6) Reporting mode RI, W 1 | | W 2_W , CQI_w | | Cqi_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in the same subframe and may be jointly or separately encoded. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W . The precoding matrix indicator W 2_W and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_W in the subband.

“Rank indicator and precoding matrix indicator W 1 ”, “precoding matrix indicator W 2_W and CQI_w” and “CQI_s” can be transmitted in three different subframes.

7) RI Reporting Mode | | W 1 | | W 2_W , CQI_w | | Cqi_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in the same subframe. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W . The precoding matrix indicator W 2_W and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_W in the subband.

“Rank indicator”, “precoding matrix indicator W 1 ”, “precoding matrix indicator W 2_W and CQI_w” and “CQI_s” can be transmitted in four different subframes.

8) RI Reporting Mode | | W 1 , CQI_w | | W 2_W , CQI_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in the same subframe. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of only W 1 . That is, if the selected W 1, W 2 is preset. In this regard, W 2 can be predefined in the form, for example, of an identity transformation matrix. The precoding matrix indicator W 1 and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_W in the subband. The precoding matrix W 2_W and the wideband CQI_s may be jointly encoded and transmitted in the same subframe.

The “rank indicator”, “the precoding matrix indicator W 1 and CQI_w” and the “precoding matrix indicator W 2_W , CQI_s" can be transmitted in three different subframes.

9) Reporting Mode RI, W 1 | | W 2_W , CQI_w | | W 2_s , CQI_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in the same subframe. The rank indicator and the precoding matrix indicator W 1 may be coded together or separately. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

W 2_S may correspond to W 2 selected from one range, wherein W 2_S may be selected from a second codebook or a subset of a second codebook.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W . The precoding matrix indicator W 2_W and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_S in the subband. The precoding matrix indicator W 2_S and CQI_s may be jointly encoded and transmitted in the same subframe.

The “rank indicator” and the precoding matrix indicator W 1 ″, the “precoding matrix indicator W 2_W and CQI_w” and the “precoding matrix indicator W 2_S and CQI_s" can be transmitted in three different subframes.

10) RI Reporting Mode | | W 1 | | W 2_W , CQI_w | | W 2_s , CQI_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in various subframes. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

W 2_S may correspond to W 2 selected from the entire range, wherein W 2_S may be selected from a second codebook or a subset of a second codebook.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W . The precoding matrix W 2_W and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_S in the subband. The precoding matrix W 2_S and CQI_s may be jointly encoded and transmitted in the same subframe.

“Rank indicator”, “precoding matrix indicator W 1 ”, “precoding matrix indicator W 2_W and CQI_w” and “precoding matrix indicator W 2_S and CQI_s” can be transmitted in four different subframes.

11) RI Reporting Mode | | W 1 , W 2_W , CQI_w | | W 2_s , CQI_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in various subframes. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook. The precoding matrix indicator W 1 , the precoding matrix indicator W 2_W, and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

W 2_S may correspond to W 2 selected from the entire range, wherein W 2_S may be selected from a second codebook or a subset of a second codebook.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W .

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_S in the subband. The precoding matrix W 2_S and CQI_s may be jointly encoded and transmitted in the same subframe.

The “rank indicator”, “the precoding matrix indicator W 1 , the precoding matrix indicator W 2_W and CQI_w” and the “precoding matrix indicator W 2_S and CQI_s" can be transmitted in three different subframes.

12) RI Reporting Mode | | W 1 , CQI_w | | W 2_s , CQI_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in various subframes. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook. The precoding matrix indicator W 1 and CQI_w may be jointly encoded and transmitted in the same subframe.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

W 2_S may correspond to W 2 selected from one range, wherein W 2_S may be selected from a second codebook or a subset of a second codebook.

Broadband CQI_w can be determined if the precoding matrix is a function of only W 1 . That is, if the selected W 1, W 2 is preset. In this regard, W 2 can be predefined in the form, for example, of an identity transformation matrix. The precoding matrix indicator W 1 and the wideband CQI_w may be jointly encoded and transmitted in the same subframe.

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_w in the subband. The precoding matrix W 2_S and CQI_s may be jointly encoded and transmitted in the same subframe.

The "rank indicator", the "precoding matrix indicator W 1 and CQI_w" and the "precoding matrix indicator W 2_S and CQI_s" can be transmitted in three different subframes.

13) RI Reporting Mode | | W 1 , W 2_W | | CQI_w | | Cqi_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in various subframes. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook. The precoding matrix indicator W 1 and the precoding matrix indicator W 2_W may be transmitted in the same subframe.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W .

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_W in the subband.

“Rank indicator”, “precoding matrix indicator W 1 ”, “CQI_w” and “CQI_s” can be transmitted in four different subframes.

14) RI Reporting Mode | | W 1 , W 2_W , CQI_w | | Cqi_s

The rank indicator and the precoding matrix indicator W 1 may be transmitted in various subframes. W 1 may be selected from the first codebook C 1 or from a subset of the first codebook.

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook. The precoding matrix indicator W 1 , the precoding matrix indicator W 2_W, and CQI_w may be jointly encoded and transmitted in the same subframe.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W .

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_W in the subband.

“Rank indicator”, “precoding matrix indicator W 1 , precoding matrix indicator W 2_W and CQI_w” and “CQI_s” can be transmitted in three different subframes.

15) Report transmission mode RI, W 1 , W 2_W | | CQI_w | | Cqi_s

The rank indicator, the precoding matrix indicator W 1, and the precoding matrix indicator W 2_W may be transmitted in the same subframe. W 1 may be selected by the first codebook C 1 or by a subset of the first codebook C 1 .

W 2_W may correspond to W 2 selected from the entire range, wherein W 2_W may be selected from a second codebook or a subset of a second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this regard, the precoding matrix indicator W 2_W may not be transmitted unambiguously.

Broadband CQI_w may be determined if the precoding matrix is a function of W 1 and W 2_W .

CQI_s may refer to a subband CQI, wherein CQI_s may be obtained on one subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_W in the subband.

The “rank indicator, precoding matrix indicator W 1 and precoding matrix indicator W 2_W ”, “CQI_w” and “CQI_s” can be transmitted in three different subframes.

Reporting Types

For each PUCCH reporting mode, five types of CQI / PMI and RI report transmission can be supported with specific periods and offsets, as shown in Table 3.

A Type 1 report supports CQI feedback regarding subbands selected by the subscriber station.

A Type 2 report supports wideband CQI and PMI feedback.

A type 3 report supports RI feedback.

A Type 4 report supports CQI broadband feedback.

A Type 5 report supports Broadband CQI and PMI for subscriber-selectable subbands. In addition, Type 5 provides the transmission of subband or wideband differential MPI and subband CQI. Two options can be proposed in this example: Type 5.0, which includes Subband (differential) PMI and subband CQI, and Type 5.1, which includes Broadband (difference) PMI and subband CQI.

[Table 3] PUCCH Reporting Type Transmitted Mode status PUCCH Reporting Modes Mode
1-1
(bit / BP)
Mode
2-1
(bit / BP)
Mode
1-0
(bit / BP)
Mode
2-0
(bit / BP)
Mode
2-2.0
Mode
2-2.1
(bit / BP)
one Subband CQI RI = 1 No 4 + L No 4 + L No RI> 1 No 7 + L No 4 + L No 2 Broadband PMI / CQI 2 transmit antennas RI = 1 6 6 No No 6 4 transmit antennas RI = 1 8 8 No No 8 8 transmit antennas RI = 1 8 8 No No 8 2 transmit antennas RI> 1 8 8 No No 8 4 transmit antennas RI> 1 eleven eleven No No eleven 8 transmitting antennas RI> 1 eleven eleven No No eleven 3 Ri 2-level spatial multiplexing one one one one one 4-level spatial multiplexing 2 2 2 2 2 8-level spatial multiplexing 3 3 3 3 3 four Broadband CQI RI = 1 or RI> 1 No No four four No 5.0 Subband CQI / Subband PMI RI = 1
RI> 1
No
No
No
No
No
No
No
No
4 + L + 2
7 + L + 2
5.1 Subband CQI / Broadband PMI RI = 1
RI> 1
No
No
No
No
No
No
No
No
4 + L + 2
7 + L + 2

Table 3 can be applied to a dual-bit subband PMI, as shown in Table 4, Table 5, and Table 6.

[Table 4] PUCCH Reporting Type Transmitted Mode status PUCCH Reporting Modes Mode
1-1
(bit / BP)
Mode
2-1
(bit / BP)
Mode
1-0
(bit / BP)
Mode
2-0
(bit / BP)
Mode
2-2.0
Mode
2-2.1
(bit / BP)
one Subband CQI RI = 1 No 4 + L No 4 + L No RI> 1 No 7 + L No 4 + L No 2 Broadband PMI / CQI 2 transmit antennas RI = 1 6 6 No No 6 4 transmit antennas RI = 1 8 8 No No 8 8 transmit antennas RI = 1 8 8 No No 8 2 transmit antennas RI> 1 8 8 No No 8 4 transmit antennas RI> 1 eleven eleven No No eleven 8 transmitting antennas RI> 1 eleven eleven No No eleven 3 Ri 2-level spatial multiplexing one one one one one 4-level spatial multiplexing 2 2 2 2 2 8-level spatial multiplexing 3 3 3 3 3 four Broadband CQI RI = 1 or RI> 1 No No four four No 5.0
5.1
5.0: Subband CQI / Subband PMI
5.1: Subband CQI / Broadband PMI
2 transmit antennas RI = 1 No No No No No
4 transmit antennas RI = 1 No No No No 4 + L + 2 8 transmit antennas RI = 1 No No No No 4 + L + 2 2 transmit antennas RI> 1 No No No No No 4 transmit antennas RI> 1 No No No No 7 + L + 2 8 transmitting antennas RI> 1 No No No No 7 + L + 2

[Table 5] PUCCH Reporting Type Transmitted Mode status PUCCH Reporting Modes Mode
1-1
(bit / BP)
Mode
2-1
(bit / BP)
Mode
1-0
(bit / BP)
Mode
2-0
(bit / BP)
Mode
2-2.0
Mode
2-2.1
(bit / BP)
one Subband CQI RI = 1 No 4 + L No 4 + L No RI> 1 No 7 + L No 4 + L No 2 Broadband PMI / CQI 2 transmit antennas RI = 1 6 6 No No 6 4 transmit antennas RI = 1 8 8 No No 8 8 transmit antennas RI = 1 8 8 No No 8 2 transmit antennas RI> 1 8 8 No No 8 4 transmit antennas RI> 1 eleven eleven No No eleven 8 transmitting antennas RI> 1 eleven eleven No No eleven 3 Ri 2-level spatial multiplexing one one one one one 4-level spatial multiplexing 2 2 2 2 2 8-level spatial multiplexing 3 3 3 3 3 four Broadband CQI RI = 1 or RI> 1 No No four four No 5.0
5.1
5.0: Subband CQI / Subband PMI
5.1: Subband CQI / Broadband PMI
2 transmit antennas RI = 1 No No No No No
4 transmit antennas RI = 1 No No No No 4 + L + 2 8 transmit antennas RI = 1 No No No No 4 + L + 2 2 transmit antennas RI = 2 No No No No No 4 transmit antennas RI = 2 No No No No 7 + L + 2 8 transmit antennas RI = 2 No No No No 7 + L + 2 2 transmit antennas RI> 2 No No No No No 4 transmit antennas RI> 2 No No No No 7 + L 8 transmitting antennas RI> 2 No No No No 7 + L

[Table 6] PUCCH Reporting Type Transmitted Mode status PUCCH Reporting Modes Mode
1-1
(bit / BP)
Mode
2-1
(bit / BP)
Mode
1-0
(bit / BP)
Mode
2-0
(bit / BP)
Mode
2-2.0
Mode
2-2.1
(bit / BP)
one Subband CQI RI = 1 No 4 + L No 4 + L No RI> 1 No 7 + L No 4 + L No 2 Broadband PMI / CQI 2 transmit antennas RI = 1 6 6 No No 6 4 transmit antennas RI = 1 8 8 No No 8 8 transmit antennas RI = 1 8 8 No No 8 2 transmit antennas RI> 1 8 8 No No 8 4 transmit antennas RI> 1 eleven eleven No No eleven 8 transmitting antennas RI> 1 eleven eleven No No eleven 3 Ri 2-level spatial multiplexing one one one one one 4-level spatial multiplexing 2 2 2 2 2 8-level spatial multiplexing 3 3 3 3 3 four Broadband CQI RI = 1 or RI> 1 No No four four No 5.0
5.1
5.0: Subband CQI / Subband PMI
5.1: Subband CQI / Broadband PMI
2 transmit antennas RI = 1 No No No No No
4 transmit antennas RI = 1 No No No No 2 + L + X 8 transmit antennas RI = 1 No No No No 2 + L + X 2 transmit antennas RI = 2 No No No No No 4 transmit antennas RI = 2 No No No No 4 + L + X 8 transmit antennas RI = 2 No No No No 4 + L + X 2 transmit antennas RI> 2 No No No No No 4 transmit antennas RI> 2 No No No No 7 + L 8 transmitting antennas RI> 2 No No No No 7 + L

Table 3 can be applied to the Y-bit subband PMI, as shown in Table 7, Table 8, and Table 10.

[Table 7] PUCCH Reporting Type Transmitted Mode status PUCCH Reporting Modes Mode
1-1
(bit / BP)
Mode
2-1
(bit / BP)
Mode
1-0
(bit / BP)
Mode
2-0
(bit / BP)
Mode
2-2.0
Mode
2-2.1
(bit / BP)
one Subband CQI RI = 1 No 4 + L No 4 + L No RI> 1 No 7 + L No 4 + L No 2 Broadband PMI / CQI 2 transmit antennas RI = 1 6 6 No No 6 4 transmit antennas RI = 1 8 8 No No 8 8 transmit antennas RI = 1 8 8 No No 8 2 transmit antennas RI> 1 8 8 No No 8 4 transmit antennas RI> 1 eleven eleven No No eleven 8 transmitting antennas RI> 1 eleven eleven No No eleven 3 Ri 2-level spatial multiplexing one one one one one 4-level spatial multiplexing 2 2 2 2 2 8-level spatial multiplexing 3 3 3 3 3 four Broadband CQI RI = 1 or RI> 1 No No four four No 5.0 5.0: Subband CQI / Subband PMI RI = 1 No No No No 4 + L + X 5.1 5.1: Subband CQI / Broadband PMI RI> 1 No No No No 7 + L + Y

[Table 8] PUCCH Reporting Type Transmitted Mode status PUCCH Reporting Modes Mode
1-1
(bit / BP)
Mode
2-1
(bit / BP)
Mode
1-0
(bit / BP)
Mode
2-0
(bit / BP)
Mode
2-2.0
Mode
2-2.1
(bit / BP)
one Subband CQI RI = 1 No 4 + L No 4 + L No RI> 1 No 7 + L No 4 + L No 2 Broadband PMI / CQI 2 transmit antennas RI = 1 6 6 No No 6 4 transmit antennas RI = 1 8 8 No No 8 8 transmit antennas RI = 1 8 8 No No 8 2 transmit antennas RI> 1 8 8 No No 8 4 transmit antennas RI> 1 eleven eleven No No eleven 8 transmitting antennas RI> 1 eleven eleven No No eleven 3 Ri 2-level spatial multiplexing one one one one one 4-level spatial multiplexing 2 2 2 2 2 8-level spatial multiplexing 3 3 3 3 3 four Broadband CQI RI = 1 or RI> 1 No No four four No 5.0
5.1
5.0: Subband CQI / Subband PMI
5.1: Subband CQI / Broadband PMI
2 transmit antennas RI = 1 No No No No No
4 transmit antennas RI = 1 No No No No 4 + L + X 8 transmit antennas RI = 1 No No No No 4 + L + X 2 transmit antennas RI> 1 No No No No No
7 + L + Y
4 transmit antennas RI> 1 No No No No (= 7 + L + 2)
7 + L + Y
8 transmitting antennas RI> 1 No No No No (= 7 + L + 2)

[Table 9] PUCCH Reporting Type Transmitted Mode status PUCCH Reporting Modes Mode
1-1
(bit / BP)
Mode
2-1
(bit / BP)
Mode
1-0
(bit / BP)
Mode
2-0
(bit / BP)
Mode
2-2.0
Mode
2-2.1
(bit / BP)
one Subband CQI RI = 1 No 4 + L No 4 + L No RI> 1 No 7 + L No 4 + L No 2 Broadband PMI / CQI 2 transmit antennas RI = 1 6 6 No No 6 4 transmit antennas RI = 1 8 8 No No 8 8 transmit antennas RI = 1 8 8 No No 8 2 transmit antennas RI> 1 8 8 No No 8 4 transmit antennas RI> 1 eleven eleven No No eleven 8 transmitting antennas RI> 1 eleven eleven No No eleven 3 Ri 2-level spatial multiplexing one one one one one 4-level spatial multiplexing 2 2 2 2 2 8-level spatial multiplexing 3 3 3 3 3 four Broadband CQI RI = 1 or RI> 1 No No four four No 5.0
5.1
5.0: Subband CQI / Subband PMI
5.1: Subband CQI / Broadband PMI
2 transmit antennas RI = 1 No No No No No
4 transmit antennas RI = 1 No No No No 4 + L + X 8 transmit antennas RI = 1 No No No No 4 + L + X 2 transmit antennas RI = 2 No No No No No
7 + L + Y
4 transmit antennas RI = 2 No No No No (= 7 + L + 2)
7 + L + Y
8 transmit antennas RI = 2 No No No No (= 7 + L + 2) 2 transmit antennas RI> 2 No No No No No 4 transmit antennas RI> 2 No No No No 7 + L 8 transmitting antennas RI> 2 No No No No 7 + L

[Table 10] PUCCH Reporting Type Transmitted Mode status PUCCH Reporting Modes Mode
1-1
(bit / BP)
Mode
2-1
(bit / BP)
Mode
1-0
(bit / BP)
Mode
2-0
(bit / BP)
Mode
2-2.0
Mode
2-2.1
(bit / BP)
one Subband CQI RI = 1 No 4 + L No 4 + L No RI> 1 No 7 + L No 4 + L No 2 Broadband PMI / CQI 2 transmit antennas RI = 1 6 6 No No 6 4 transmit antennas RI = 1 8 8 No No 8 8 transmit antennas RI = 1 8 8 No No 8 2 transmit antennas RI> 1 8 8 No No 8 4 transmit antennas RI> 1 eleven eleven No No eleven 8 transmitting antennas RI> 1 eleven eleven No No eleven 3 Ri 2-level spatial multiplexing one one one one one 4-level spatial multiplexing 2 2 2 2 2 8-level spatial multiplexing 3 3 3 3 3 four Broadband CQI RI = 1 or RI> 1 No No four four No 5.0
5.1
5.0: Subband CQI / Subband PMI
5.1: Subband CQI / Broadband PMI
2 transmit antennas RI = 1 No No No No No
4 transmit antennas RI = 1 No No No No 2 + L + X 8 transmit antennas RI = 1 No No No No 2 + L + X 2 transmit antennas RI = 2 No No No No No 4 transmit antennas RI = 2 No No No No 4 + L + Y 8 transmit antennas RI = 2 No No No No 4 + L + Y 2 transmit antennas RI> 2 No No No No No 4 transmit antennas RI> 2 No No No No 7 + L 8 transmitting antennas RI> 2 No No No No 7 + L

FIG. 2 illustrates an example of a communication method of a transmitter and a receiver in which the transmitter and the receiver share a rank indicator, a precoding matrix indicator, and channel quality information.

In accordance with FIG. 2, the receiver may correspond to a terminal device in downlink communication and, therefore, correspond to a base station in uplink communication. The transmitter may correspond to a base station in downlink communication and, therefore, correspond to a terminal device in uplink communication.

At 210, the receiver estimates the channel from the transmitter to the receiver. The receiver can estimate the channel using a known signal transmitted from the transmitter. A transmitter may comprise a plurality of transmit antennas, for example, two transmit antennas, four transmit antennas, eight transmit antennas, sixteen transmit antennas, etc. The receiver comprises at least one receiving antenna.

At 220, the receiver generates a rank indicator (RI) indicative of the number of preferred levels, for example, ranks. At 230, the receiver generates a precoding matrix indicator (PMI) indicative of a preferred precoding matrix using a predefined codebook based on the rank indicator. In accordance with some examples, at least two precoding matrix indicators may be generated based on at least two predetermined codebooks. In this example, the final precoding matrix can be defined as the scalar product between at least two precoding matrices selected from each of the at least two codebooks.

At 240, the receiver generates CQI based on the rank indicator and the precoding matrix indicator.

At 250, the receiver transmits a rank indicator, precoding matrix indicator, and CQI via PUSCH or PUCCH over the feedback channel.

At 260, the transmitter generates a substantially optimal precoding matrix based on the feedback rank indicator, precoding matrix indicator, and CQI. At 270, the transmitter precodes the data streams. At 280, precoded data is transmitted to a receiver, for example, through multiple transmit antennas.

FIG. 3 illustrates an example of a transmitter and a receiver that share a first precoding matrix indicator, a second precoding matrix indicator, and channel quality information. With reference to FIG. 3 further describes a reporting mode 1-2.1 using PUSCH and two reporting modes using PUCCH.

With reference to FIG. 3, a communication method is described for a transmitter and a receiver operating in accordance with a reporting mode 1-2.1 using PUSCH.

1. Reporting mode 1-2.1 using PUSCH

At 310, the transmitter and receiver operate in accordance with a 1-2.1 reporting mode using PUSCH.

At 320, the receiver generates a first precoding matrix indicator by selecting a first precoding matrix W 1 from the first codebook C 1 . If there are multiple subbands, the receiver can generate a precoding matrix indicator with respect to the set of subbands from the first codebook C 1 , if the transmitter is transmitting in the set of subbands.

The first codebook C 1 may differ from the second codebook C 2 , wherein the first codebook C 1 and the second codebook C 2 may be subsets of the same complete codebook.

At 330, the receiver generates a second precoding matrix indicator by selecting a second precoding matrix W 2 from the second codebook C 2 . In this example, if only a selected subband is transmitted with respect to each subband, the receiver may generate a second precoding matrix indicator of a second precoding matrix W 2 from a second codebook C 2 .

At 340, the receiver determines one wideband CQI per codeword when transmitted in a set of subbands, if a corresponding precoding matrix W is applied in each subband.

At 350, a receiver may transmit a first precoding matrix indicator, a second precoding matrix indicator, and wideband CQI via PUSCH over the feedback channel.

The precoding matrix indicator and CQI may be determined based on the transmitted rank indicator, and the subband size may be determined in accordance with various methods that are known or specifically designed for the examples described herein. The threshold indicator of rank RI threshold can take various values, for example, 2.

In 360, in case the first precoding matrix indicator, the second precoding matrix indicator, and the wideband CQI are transmitted through the feedback channel to the transmitter, the transmitter generates a substantially optimal precoding matrix using the first codebook C 1 and the second codebook C 2 .

At 370, the transmitter precodes at least one data stream using the generated precoding matrix. At 380, the precoded at least one data stream may be transmitted through multiple transmit antennas.

2. Reporting Mode RI | | W 1 | | W 2_W , CQI_w using PUCCH

At 310, a receiver and a transmitter identify a reporting mode for feedback information. With respect to the present example, it can be assumed that a rank indicator is generated indicating the preferred rank of the receiver.

At 320, a first codebook receiver C 1 generates a first precoding matrix indicator with respect to a set of multiple subbands or a predetermined range from multiple subbands. The first precoding matrix corresponding to the first indicator of the precoding matrix may be referred to as W 1 .

At 330, a second codebook receiver C 2 generates a second precoding matrix indicator for a set of multiple subbands. The second precoding matrix corresponding to the second indicator of the precoding matrix may be referred to as W 2_W . W 2_W may correspond to W 2 selected from the entire range, and selected by the second codebook or by a subset of the second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this case, the indicator of the precoding matrix W 2_W may not be transmitted unambiguously.

The receiver 340 may determine broadband CQI_w, if the precoding matrix is a function of W 1 and W 2_W. In this example, the receiver can determine CQI_w with respect to a set of multiple subbands using a first precoding matrix indicator and a second precoding matrix indicator.

The precoding matrix indicator W 2_W and CQI_w may be jointly encoded.

At 350, a receiver may transmit a rank indicator at the first reporting time and may transmit a first precoding matrix indicator at a second reporting time. The receiver may also transmit via feedback the second indicator of the precoding matrix for the set of multiple subbands and CQI_w for the set of multiple subbands at the third reporting time.

The first report transmission time, the second report transmission time, and the third report transmission time may correspond to different subframes.

In particular, a receiver may transmit a rank indicator based on a first reporting time and may transmit a first indicator of a precoding matrix based on a second reporting period. The receiver may also feed back a second precoding matrix indicator with respect to the set of multiple subbands and CQI with respect to the set of multiple subbands based on the third reporting period.

As described above with respect to the reporting mode 1-2.1 using PUSCH, operations 360 through 380 are performed by the transmitter.

3. Reporting Mode RI | | W 1 | | W 2_W , CQI_w | | W 2_S , CQI_s using PUCCH

At 310, a receiver and a transmitter identify a reporting mode for feedback information.

At 320, a first codebook receiver C 1 generates a first precoding matrix indicator with respect to a set of multiple subbands or a predetermined range from multiple subbands. The first precoding matrix corresponding to the first indicator of the precoding matrix may be referred to as W 1 .

At 330, a second codebook receiver C 2 generates a second precoding matrix indicator for a set of multiple subbands. The second precoding matrix corresponding to the second indicator of the precoding matrix may be referred to as W 2_W . W 2_W may correspond to W 2 selected from the entire range, and selected by the second codebook or by a subset of the second codebook.

If the subset regarding the second codebook contains only one element, a one-to-one correspondence can be established between W 1 and W 2_W . In this case, the indicator of the precoding matrix W 2_W may not be transmitted unambiguously.

At 330, the receiver generates a second precoding matrix indicator with respect to a set of multiple subbands and can also generate a second precoding matrix indicator W 2_W from each second predetermined subband from a second codebook C 2 . For clarity, the second indicator of the precoding matrix W 2_W for each predefined subband is referred to in this example as the third indicator of the precoding matrix. In this regard, in 330, the receiver can generate W 2_W and W 2_S from the second codebook C 2 .

At 340, the receiver generates wideband CQI_w and subband CQI_s.

In this example, the broadband CQI_w can be determined if the precoding matrix is a function of W 1 and W 2_W. CQI_s may refer to a subband CQI and may be obtained on a single subband. For example, CQI_s may be selected over part of a range. CQI_s may be determined if the precoding matrix is a function of W 1 and W 2_W in the subband.

At 350, the receiver transmits through the feedback channel in four different subframes “rank indicator”, “first indicator of precoding matrix W1”, “second indicator of precoding matrix W 2_W and CQI_w” and “third indicator of precoding matrix W 2_S and CQI_s”.

Four different subframes may correspond to the first four moments of reporting.

As described above with respect to the reporting mode 1-2.1 using PUSCH, operations 360 through 380 are performed by the transmitter.

FIG. 4 illustrates an example of a transmitter and a receiver that share a first precoding matrix indicator, a second precoding matrix indicator, channel quality information and difference information.

Below with reference to FIG. 4 describes the mode of reporting 3.1 using PUSCH.

At 410, a receiver and a transmitter identify a reporting mode for feedback information.

At 420, a first codebook receiver C 1 generates a first precoding matrix indicator by selecting a first precoding matrix W 1 . When transmitting in a set of subbands, the first indicator of the precoding matrix of one first precoding matrix W 1 may be generated from the first codebook C 1 .

At 430, the second codebook receiver C 2 generates a second precoding matrix indicator by selecting a second precoding matrix W 2 . When transmitting in the set of subbands, the first indicator of the precoding matrix of one second precoding matrix W 2 can be generated by the second codebook C 2 .

At 440, the receiver generates one subband CQI per codeword for each subband. In this example, the subband CQI can be determined by transmitting in the corresponding subband if W (that is, a function of W 1 and W 2 ) is applied in all subbands. Similarly, broadband CQI can be determined by transmitting in the corresponding subband if W (that is, a function of W 1 and W 2 ) is applied in all subbands.

At 450, the receiver generates differential information related to the difference between the CQI associated with the set of multiple subbands and the subband CQI associated with each codeword. Difference information can be encoded using one bit, two bits, three bits, etc.

At 460, the receiver transmits a first precoding matrix indicator, a second precoding matrix indicator, wideband CQI, and subband CQI through a feedback channel. At least one of the indicated - broadband CQI and subband CQI - can be replaced by difference information. All of the above - wideband CQI, subband CQI and differential information - can be transmitted through the feedback channel.

At 470, the transmitter generates a substantially optimal precoding matrix. At 480, the transmitter precodes at least one data stream using the generated precoding matrix. At 490, the precoded at least one data stream may be transmitted through multiple transmit antennas.

FIG. 5 illustrates an example of a communication device 500. Communication device 500 may be applicable to both a transmitter and a receiver.

In accordance with FIG. 5, the communication device 500 comprises a storage device 510, a processor 520, and a communication interface 530.

The first codebook and second codebook, which are subsets of the complete codebook, may be stored in memory 510.

The processor 520 may generate a corresponding precoding matrix indicator from both the first codebook and the second codebook, or it may retrieve the corresponding precoding matrix corresponding to the corresponding precoding matrix indicator. For example, if the communication device 500 is installed or implemented in the receiver, the processor 520 may generate a corresponding precoding matrix from both the first codebook and the second codebook. If the communication device 500 is installed or implemented in the transmitter, the processor 520 may retrieve the precoding matrix corresponding to the indicator of the precoding matrix generated by both the first codebook and the second codebook. The processor 520 may also generate the precoding matrix ultimately applied, or it may generate CQI. The above transmitter and receiver operations, as a rule, can be performed by the processor 520.

The connected interface 530 may transmit or receive a corresponding indicator of the precoding matrix generated by both the first codebook and the second codebook.

The processes, functions, methods and / or software described above can be recorded, stored or fixed on one or more computer-readable storage media that contain computer-implemented programs to ensure the execution or implementation of these instructions by the processor. Media can also contain - on their own or in conjunction with programs - data files, data structures, etc. Media and programs can be specially designed and created, or they can be of a type known and accessible to specialists in the field of computer software. Examples of computer-readable storage media include magnetic media such as hard disk drives, floppy disk drives, and magnetic tape; optical media such as compact discs (CD-ROM) or universal digital discs (DVD); magneto-optical media such as optical discs; and hardware devices that are specifically configured to store and execute programs, such as read-only memory (ROM), random access memory (RAM), flash memory, etc. Examples of programs include both machine code, such as that generated by the compiler, and files containing higher-level code that can be executed by a computer using an interpreter. The described hardware devices can be configured to act as one or more software modules that are recorded, stored or fixed in one or more computer-readable storage media for the purpose of performing the above operations and methods, or vice versa. In addition, a computer-readable storage medium may be distributed over computer systems connected through a network, and non-computer-readable codes or programs that change over time can be stored and executed decentrally.

A number of examples have been described above. However, it should be understood that various changes may be made. For example, corresponding results can be achieved if the described methods are implemented in a different order and / or if the components in the described system, architecture, device or circuit are combined in another way and / or replaced or supplemented by other components or their equivalents. In this regard, other implementations are within the scope of the following claims.

Claims (34)

1. The communication method performed by the receiver, the method comprising:
determining the reporting mode in accordance with the feedback information to be transmitted to the transmitter;
generating, according to the first codebook, a first indicator of a precoding matrix with respect to a set of a plurality of subbands;
generating, according to the second codebook, a second precoding matrix indicator in relation to at least one subband of the plurality of subbands; and
transmitting feedback information to the transmitter, wherein the feedback information comprises a first precoding matrix indicator and a second precoding matrix indicator.
2. The communication method according to claim 1, further comprising generating channel quality information related to the set of the multiple subbands based on the precoding matrix, which corresponds to both the first indicator of the precoding matrix and the second indicator of the precoding matrix, moreover, the information The feedback further comprises channel quality information.
3. The communication method according to claim 1, wherein the feedback information is transmitted on a common physical channel of the uplink (PUSCH).
4. The communication method according to claim 1, wherein the first codebook and the second codebook are different from each other, wherein each of the first codebook and the second codebook corresponds to a subset of the same complete codebook.
5. The communication method according to claim 2, wherein the channel quality information is generated based on a predetermined rank indicator or rank indicator determined at the receiver.
6. The communication method performed by the transmitter, the method comprising:
determining the reporting mode in accordance with the feedback information transmitted from the receiver to the transmitter;
receiving a first indicator of the precoding matrix and a second indicator of the precoding matrix, which are transmitted by the receiver in accordance with the reporting mode; and
generating a precoding matrix based on the first indicator of the precoding matrix and the second indicator of the precoding matrix,
moreover, in the reporting mode, the first indicator of the precoding matrix is generated by the first codebook with respect to the set of the multiple subbands, and the second indicator of the precoding matrix is generated by the second codebook with respect to the at least one subband of the multiple subbands.
7. The communication method according to claim 6, further comprising receiving channel quality information associated with a set of multiple subbands.
8. The communication method according to claim 6, in which, in the reporting mode, channel quality information is generated based on the precoding matrix, which corresponds to both the first indicator of the precoding matrix and the second indicator of the precoding matrix.
9. The communication method according to claim 6, in which the first indicator of the precoding matrix and the second indicator of the precoding matrix are received on a common physical channel of the uplink (PUSCH).
10. The communication method according to claim 6, in which the first codebook and the second codebook are different from each other, each of the first codebook and the second codebook corresponding to a subset of the same complete codebook.
11. The communication method performed by the receiver, the method comprising:
determining a reporting mode according to feedback information to be transmitted to the transmitter, the reporting mode being determined among the reporting modes and comprising a first reporting mode and a second reporting mode;
in the first reporting mode:
generating, according to the first codebook, a first indicator of a precoding matrix with respect to a set of a plurality of subbands,
second codebook generation of a second indicator of a precoding matrix with respect to
at least one subband of a plurality of subbands;
in the second reporting mode:
generating a first precoding matrix indicator and a second precoding matrix indicator with respect to the plurality of subbands; and
transmitting feedback information to the transmitter, wherein the feedback information comprises a first precoding matrix indicator and a second precoding matrix indicator.
12. The communication method according to claim 11, further comprising generating channel quality information related to the set of the multiple subbands based on the precoding matrix, which corresponds to both the first indicator of the precoding matrix and the second indicator of the precoding matrix, wherein The feedback further comprises channel quality information.
13. The communication method according to claim 12, further comprising generating differential information corresponding to the difference between the channel quality information associated with the set of the multiple subbands and the channel quality information associated with the predetermined subband of the multiple subbands, wherein the feedback information is further contains differential information.
14. The communication method according to claim 11, wherein the first codebook and the second codebook are different from each other, each of the first codebook and the second codebook corresponding to a subset of the same complete codebook.
15. The communication method of claim 12, wherein the channel quality information is generated based on a predefined rank indicator or based on a rank indicator determined at the receiver.
16. A communication method performed by a transmitter, the method comprising:
determining the reporting mode in accordance with the feedback information transmitted from the receiver to the transmitter, the reporting mode being determined among the reporting modes and comprising a first reporting mode and a second reporting mode;
receiving a first indicator of the precoding matrix and a second indicator of the precoding matrix, which are transmitted by the receiver in accordance with the reporting mode; and
generating a precoding matrix based on a first indicator of the precoding matrix and a second indicator of the precoding matrix, wherein
in a first reporting mode, a first precoding matrix indicator is generated according to a first codebook with respect to a set of a plurality of subbands, and a second precoding matrix indicator is generated by a second codebook with respect to at least one subband of a plurality of subbands, and
in a second reporting mode, a first precoding matrix indicator and a second precoding matrix indicator are generated for a plurality of subbands.
17. The communication method according to claim 16, further comprising receiving channel quality information associated with a set of multiple subbands.
18. The communication method according to claim 17, further comprising receiving difference information corresponding to the difference between the channel quality information associated with the set of the multiple subbands and the channel quality information associated with the predetermined subband of the multiple subbands.
19. A communication method performed by a receiver, the method comprising:
generating a rank indicator indicating a preferred rank of the receiver;
generating, according to the first codebook, a first indicator of a precoding matrix with respect to a set of a plurality of subbands or a predetermined subband of a plurality of subbands;
generating, according to the second codebook, a second indicator of a precoding matrix with respect to a set of a plurality of subbands;
generating channel quality information associated with a set of multiple subbands; and
transmitting a rank indicator at the first time of reporting, transmitting a first indicator of a precoding matrix at a second time of transmitting reports and transmitting a second indicator of a precoding matrix and channel quality information at a third reporting time.
20. The communication method according to claim 19, in which the first moment of time for transmitting reports, the second time for transmitting reports and the third time for transmitting reports correspond to different subframes.
21. The communication method of claim 19, wherein the second precoding matrix indicator and channel quality information are jointly encoded for transmission.
22. The communication method of claim 19, wherein transmitting the rank indicator, the first indicator of the precoding matrix, the second precoding matrix and channel quality information further includes transmitting the rank indicator based on the first reporting period, transmitting the first indicator of the precoding matrix to based on the second reporting period and transmitting the second indicator of the precoding matrix and channel quality information based on the third reporting period Comrade.
23. The communication method according to claim 19, in which the channel quality information is generated in accordance with the first indicator of the precoding matrix and the second indicator of the precoding matrix.
24. A communication method performed by a transmitter, the method comprising:
determining the reporting mode in accordance with the feedback information transmitted from the receiver to the transmitter;
receiving from the receiver a rank indicator at the first time of reporting, a first indicator of a precoding matrix at a second time of reporting and a second indicator of a precoding matrix regarding a set of a plurality of subbands and channel quality information associated with a set of a plurality of subbands at a third reporting time ;
determining, based on the reporting mode of the reports, a rank indicator, a first indicator of a precoding matrix, a second indicator of a precoding matrix and channel quality information, and
generating a precoding matrix based on at least a first indicator of the precoding matrix and a second indicator of the precoding matrix.
25. The communication method according to claim 24, wherein the first time for transmitting reports, the second time for transmitting reports, and the third time for transmitting reports correspond to different subframes.
26. The communication method of claim 24, wherein the reception further includes receiving a rank indicator based on a first reporting period, receiving a first indicator of a precoding matrix based on a second reporting period, and receiving a second indicator of a precoding matrix and channel quality information on basis of the third reporting period.
27. The communication method performed by the receiver, the method comprising:
generating a rank indicator indicating a preferred rank of the receiver;
generating, according to the first codebook, a first indicator of a precoding matrix with respect to a set of a plurality of subbands or at least one predefined subband of a plurality of subbands;
generating, according to the second codebook, a second indicator of a precoding matrix with respect to a set of a plurality of subbands;
generating first channel quality information associated with a set of multiple subbands;
generating a third precoding matrix indicator for each predetermined subband of the plurality of subbands;
generating second channel quality information associated with each predetermined subband of the plurality of subbands, and
transmitting the rank indicator at the first time of transmitting reports, transmitting the first indicator of the precoding matrix at the second time of transmitting reports, transmitting the second indicator of the precoding matrix and the first channel quality information at the third time of transmitting reports, and transmitting the third indicator of the precoding matrix and second channel quality information to fourth reporting time.
28. The communication method according to claim 27, wherein the first time for transmitting reports, the second time for transmitting reports, the third time for transmitting reports and the fourth time for transmitting reports correspond to different subframes.
29. The communication method of claim 27, wherein the transmission further includes transmitting a rank indicator based on a first reporting period, transmitting a first precoding matrix indicator based on a second reporting period, transmitting a second precoding matrix indicator and channel quality information to based on the third reporting period and transmitting the third indicator of the precoding matrix and channel quality information based on the fourth reporting period.
30. A communication method performed by a transmitter, the method comprising:
determining the reporting mode in accordance with the feedback information transmitted from the receiver to the transmitter;
receiving a rank indicator from the receiver at the first time of reporting, receiving a first indicator of a precoding matrix for a set of a plurality of subbands or at least one predetermined range of a plurality of subbands at a second reporting time, receiving a second indicator of a precoding matrix for a set of a plurality of subbands and first channel quality information associated with a set of a plurality of subbands at a third reporting time and receiving third a pre-coding matrix indicator for each predefined subband and second channel quality information associated with each predefined subband at the fourth reporting time;
determining, based on the reporting mode of the reports, the rank indicator, the first indicator of the precoding matrix, the second indicator of the precoding matrix, the first channel quality information, the third indicator of the precoding matrix and the second channel quality information; and
generating a precoding matrix based on at least a first indicator of the precoding matrix, a second indicator of the precoding matrix, and a third indicator of the precoding matrix.
31. The communication method according to claim 30, wherein the first time for transmitting reports, the second time for transmitting reports, the third time for transmitting reports and the fourth time for transmitting reports correspond to different subframes.
32. The communication method according to claim 30, wherein the reception further includes receiving a rank indicator based on a first reporting period, receiving a first indicator of a precoding matrix based on a second reporting period, receiving a second indicator of a precoding matrix and first channel quality information based on the third reporting period and receiving the third indicator of the precoding matrix and the second channel quality information based on the fourth reporting period.
33. A permanent computer-readable storage medium that stores a program for implementing the method according to claim 1.
34. A communication device installed in at least one of the transmitter and receiver, and including:
a storage device configured to store the first codebook and second codebook;
a processor configured to generate a corresponding precoding matrix indicator from the first codebook and the second codebook, and extracting a precoding matrix associated with the corresponding indicator of the precoding matrix, and
a communication interface configured to transmit and / or receive between the transmitter and the receiver the corresponding indicator of the precoding matrix generated by the first codebook and the second codebook,
wherein the first codebook and the second codebook are subsets of the complete codebook,
wherein a first precoding matrix indicator is generated with respect to a set of a plurality of subbands in the first codebook, and a second precoding matrix indicator with respect to at least one subband of a plurality of subbands is generated in a second codebook.
RU2012151279/08A 2010-04-30 2011-04-29 Multiple input - multiple output communication system, supporting different reporting modes RU2586875C2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US32963410P true 2010-04-30 2010-04-30
US61/329,634 2010-04-30
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